Sand filtration
Sand filtration serves to capture impurities contained in the water. They use natural principles for this. The pool water passes through a sand filter cartridge in which mechanical impurities are captured and clean water is returned to the pool. The filter unit should filter the entire volume of the pool in 6-8 hours. For heavily loaded pools or at high air temperatures, pee-filtering the water after 3-4 hours is recommended. Filtration consists of a sand filter with a pressure gauge, a pump with a coarse dirt trap and a control valve. A control valve (normally 4 to 6-way) that switches to filtration, backwashing, filter flushing, draining, shutoff, or circulation as needed when the pump is off. The maintenance requirements of sand filtration are minimal: the sand filling is washed as standard once a week (depending on the volume of the pool), the replacement of the sand filling is enough every 2 to 3 years. Sand filters are very effective and allow the connection of other accessories such as solar heater or pool vacuum cleaners.